Road Effects on Food Availability and Energetic Intake in Florida Scrub-Jays (<i>Aphelocoma coerulescens</i>)

Morgan, Gina; Boughton, Raoul K.; Rensel, Michelle A.; Schoech, Stephan J.

doi:10.1525/auk.2010.09033

Cited by 20 publications

(11 citation statements)

References 59 publications

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“…Arthropods also seem to be the invertebrates most consumed by corvids (Anjos, 1991;Reinert and Bornschein, 1998;Amaral and Macedo, 2003;Langen and Vehrencamp, 1998;Morgan et al, 2010;Nocedal, 2010;Uejima et al, 2012). Although no vertebrate species have been recorded as actually being consumed by White-naped jays, the attempts to attack bird nests, as observed in the present study, is ample evidence of this predatory behavior being typical in jays, although only opportunistically.…”

Section: Dietsupporting

confidence: 53%

“…This also applies to the Azure Jay (Anjos, 1991), the Plush-crested Jay (Uejima et al, 2012), the Florida Scrub Jay Aphelocoma coerulescens (Bosc, 1795) (Morgan et al, 2010), and the Curl-crested Jay (Amaral and Macedo, 2003), thereby demonstrating that the various jay species appear to exploit the resources available at the various times of the year and in the different regions, in a similar and effective manner.…”

Section: Dietmentioning

confidence: 87%

“…In this study, a well-coordinated hierarchy between White-naped Jay individuals was observed during foraging, with the mutual sharing of food resources, and no direct competition. However, this strategy has not been reported among other congeneric species, not even by Morgan et al (2010), when studying the Florida Scrub Jay. Through the absence of sexual dimorphism in the plumage coloration of Whitenaped Jays, at the moment it was impossible to ascertain whether the hierarchy manifest during foraging could be associated to dominance, age, gender, degree of kinship, or affinity between individuals.…”

Section: Feeding Behaviormentioning

confidence: 99%

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Diet and feeding behavior of the White-naped Jay, Cyanocorax cyanopogon (Wied, 1821) (Aves, Passeriformes, Corvidae) in a disturbed environment in central Brazil

Barros¹,

Costa²,

Pascotto³

2014

Braz. J. Biol.

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The White-naped Jay Cyanocorax cyanopogon (Wied, 1821) is an omnivorous and opportunistic species, with a multifarious diet. In view of the scarcity of available data in the literature, the aim was to investigate and describe the bird's diet, location of food items, foraging tactics, actual feeding behavior and intraspecific interactions, as a means of defining the items consumed. The study was carried out in a Cerrado area in the Araguaia Campus of the Federal University of Mato Grosso -UFMT, in Pontal do Araguaia, Mato Grosso State, Brazil, from August to December, 2006, and from April to October, 2010. All the feeding events were recorded through 136 hours of animal focal sampling, whereby it was shown that these birds predominantly consume animal nutrients, replenished by vegetable items and human food-waste. Arthropods were predominant in the diet, with ants as the most abundant and frequent item. The fruits, flowers and seeds of eleven plant species were also consumed. Food-waste, representing about 1/10 of the total, was constantly consumed even when other food sources were available. Although active among the various strata, foraging is mainly on the ground. In the event of food-scarcity, the strategy employed is the hierarchical deployment of the members of various-sized groups, with the avoidance of direct competition. This versatility during all seasons, confirms total adaptation to the anthropic environment surrounded by native habitats that characterized the study site.Keywords: anthropic environment, Cerrado, intraspecific interactions, food items, social organization. Dieta e comportamento alimentar de

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Section: Dietsupporting

confidence: 53%

Section: Dietmentioning

confidence: 87%

Section: Feeding Behaviormentioning

confidence: 99%

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Diet and feeding behavior of the White-naped Jay, Cyanocorax cyanopogon (Wied, 1821) (Aves, Passeriformes, Corvidae) in a disturbed environment in central Brazil

Barros¹,

Costa²,

Pascotto³

2014

Braz. J. Biol.

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“…Thus, communication breakdown caused by noise may at least partly be responsible for lower body mass in nestlings located closer to roads. A more direct mechanism associating proximity to roads with lower offspring body mass is the fact that a greater proportion of impervious surface close to the nestbox automatically results in lower levels of biomass and resulting food availability for our focal species (but see the opposite effect in Florida scrub jays Morgan et al, 2010). Moreover, roads are associated with many biotic and abiotic changes, for example: increased mortality in birds due to direct collisions with vehicles, but also the general alteration of physical and chemical properties in these novel environments (Reijnen et al, 1995;Erritzoe et al, 2003; but see review by Trombulak and Frissell, 2000).…”

Section: Discussionmentioning

confidence: 99%

Humans and Tits in the City: Quantifying the Effects of Human Presence on Great Tit and Blue Tit Reproductive Trait Variation

et al. 2017

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Environmental conditions are key drivers of life-history evolution, and the urban environment is an extreme form of land-use readily inhabited by avian wildlife, whose life-history variation in such altered environment is still poorly understood. Recently, the study of environmental variables associated with urban living-which include shifts in temperature, light, noise or food availability-has attracted increased attention. Another environmental axis that sets the urban space at odds relative to natural habitats is high human abundance, yet very little is known about its effect on avian fitness. We developed a protocol to quantify human presence by performing repeated counts of humans on the ground within a 15 m radius of nestboxes monitored in two centrally-located study areas of a European capital city. In parallel, a GIS-based approach was used to infer nestbox distance to the nearest path and road. Multiple counts of human presence around each nestbox yielded moderate to high repeatabilities (0.6 ≤ r ≤ 0.8) while requiring considerable resources time-and people-wise. In contrast, GIS-based estimates of nestbox distance to paths and roads were time efficient and generated highly repeatable results. The effects of (i) human presence around each nestbox, (ii) nestbox distance to the nearest path and (iii) nestbox distance to the nearest road were tested on reproductive traits of blue tits Cyanistes caeruleus and great tits Parus major breeding in two urban sites. Human presence did not influence blue tit or great tit life-history traits and reproductive success, suggesting reproductive habituation to humans in an urban landscape. In contrast, nestbox distance to roads shortened incubation time in great tits while nestbox distance to paths increased incubation time in blue tits. Moreover, blue tit offspring 2 weeks after hatching were lighter closer to roads. Our study confirms the reliability of a field protocol capturing human presence around multiple fixed locations that can be easily implemented in either urban or rural landscapes. At the same time, it appears that when applied to two urban sites where habituation to humans might have occurred, it is infrastructural networks rather than human presence per se that played a greater role in tit reproductive trait variation.

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“…Noisy environments influence bird community composition by favoring certain species (Stone 2000, Rheindt 2003) and can modify community structure by disrupting, for example, predator–prey interactions (Rheindt 2003, Francis et al 2009). Other impacts of noise on birds include reduced pairing success (Habib et al 2007), reduced densities near roads (Reijnen and Foppen 1994, Rheindt 2003), or increased food availability (Morgan et al 2010).…”

mentioning

confidence: 99%

Effects of road construction noise on the endangered golden‐cheeked warbler

Lackey

Morrison

Loman

et al. 2011

Wildlife Society Bulletin

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Noise pollution can mask or distort bird songs, which can inhibit mating success, predator detection, and parental response to begging calls. Using an impact assessment design, we examined the potential influence of road construction and road noise on territory placement, reproductive success, and density of the federally endangered golden-cheeked warbler (Dendroica chrysoparia) at 3 sites: adjacent to road construction, adjacent to road-noise only, and a control with no noise or activity. Although not statistically significant, reproductive success was about 20% higher and stable at road-noise-only sites relative to other treatments. Warbler density was similar among sites (construction ¼ 0.305 birds/ha; road-noise ¼ 0.357 birds/ha; and control ¼ 0.328 birds/ha). Average distance from road was similar for territories with paired adults (road-noise ¼ 291 m. Overall noise levels were low: ambient noise was similar in the construction and road-noise-only sites (X ¼ 32 dB) and showed little auditory difference from the control (X ¼ 28 dB). Our results indicate that construction activities and road-noise did not appear to impact territory placement, reproductive success, or local densities of golden-cheeked warblers under the treatment regime we studied. ß 2011 The Wildlife Society.

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Road Effects on Food Availability and Energetic Intake in Florida Scrub-Jays (Aphelocoma coerulescens)

Cited by 20 publications

References 59 publications

Diet and feeding behavior of the White-naped Jay, Cyanocorax cyanopogon (Wied, 1821) (Aves, Passeriformes, Corvidae) in a disturbed environment in central Brazil

Diet and feeding behavior of the White-naped Jay, Cyanocorax cyanopogon (Wied, 1821) (Aves, Passeriformes, Corvidae) in a disturbed environment in central Brazil

Humans and Tits in the City: Quantifying the Effects of Human Presence on Great Tit and Blue Tit Reproductive Trait Variation

Effects of road construction noise on the endangered golden‐cheeked warbler

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